yeah, I saw someone do that, but i thought maybe the rear deak hole would bottle neck the flow, kinda like a reverse ported. How much air space do you think would be necessary? I could back it up a little, but obviously i dont want to take up all my trunk space. Also so you think If i enlarged the rear deck to 8 inches, i t would be enough for a 15 inch to fire through at the opposite side fo a box?